| OFFICE AUTOMATION | AUTOMOTIVE | CAMERA |
| CANON HI-TECH (THAILAND) LTD. | Over sea | NIKON (THAILAND) CO.,LTD. |
| CANON PRACHINBURI (THAILAND) LTD. | NIDEC TOSOK CORPORATION | THAI MICRO CO.,LTD. |
| NIHON F.T.B. (THAILAND) CO.,LTD. | NACHI (JIANGSU) INDUSTRIES CO.,LTD. | SEIKO PRECISION (THAILAND) CO.,LTD. |
| SUMIRIKO CHEMICAL AND PLASTIC PRODUCTS (THAILAND) LTD. | HITACHI AUTOMOTIVE SYSTEMS AMERICAS, INC. | |
| OKI DATA MANUFACTURING (THAILAND) CO.,LTD. | Domestic | OTHER |
| DAIDO ELECTRONICS (THAILAND) CO.,LTD. | TOSTEM THAI CO.,LTD. | |
| EKK EAGLE (THAILAND) CO.,LTD. | YAMATO ESULON (THAILAND) CO.,LTD. | |
| HITACHI AUTOMOTIVE SYSTEMS ASIA LTD. | ||
| KEIHIN AUTO PARTS (THAILAND) CO.,LTD. | ||
| KOMATSU SEIKI (THAILAND) CO.,LTD. | ||
| MIKUNI (THAILAND) CO.,LTD. | ||
| THAI YAMAHA MOTOR CO.,LTD. | ||
| YAMASEI THAI CO.,LTD. | ||
| SANSHIN HIGH TECHNOLOGY (THAILAND) LTD. |